Bollinger Bands

show the volatility of a stock based on Standard Deviation around a Simple Moving Average. The bands widen when volatility increases and narrow when volatility decreases.

Calculation

Bollinger Bands have 3 lines. The middle line is just the Simple Moving Average.

The Upper is calculated as SMA + (Standard Deviation * Number of Deviations).

The Lower is calculated as SMA - (Standard Deviation * Number of Deviations).

The default Period for the SMA and SD is 20 and the default Number of Deviations is 2.

Possible Variations

The default input to Bollinger Bands is Close Price but you could use a Custom Input of Typical Price or Weighted Close instead.

Related Indicators

Bollinger Band %b

Bollinger Band Width %

Custom Dates

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Symbol Id Name Exchange Close Price Trade Date
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AAPLAPPLE INC.4/28/2017Nasdaq GS143.65004/28/2017NGSM
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